think you have posted in the wrong section mate
Try the airgun section rather than sales
In answer to your question, i wouldnt pay much to be honest.
I picked one up for £290 virtually mint with a very good scope, bag etc
They are not bad guns they are built by evanix, a good manufacturer and re-badged as a prestige.
Please be aware that as far as i know prestige air guns are in the process of being struk off at company house so spares will probably be a issue in the future as i dont believe evanix have a distributor in the uk
Might be wise to go for something by a more trusted brand wei